Let the Paypal garnishment "ride" for a while. He may be stupid enough to keep using it such that more funds get put into it and are thereby held for you. It may also crimp his style enough that he may decide to pay the rest of the judgment to get you to release the hold on the Paypal account. Did you ask Paypal for the bank and account number that they "settle" funds to? (In other words, when the defendant wants his money from Paypal, where does Paypal send the money? If Paypal wires the money to the defendant's bank account, then you want to know the bank routing number and account number so that you can garnish that bank account - assuming that bank account is in the name of the defendant.)
WRT his tenant, some states let you garnish payments from a tenant to a landlord (if you have a judgment against the landlord), but it doesn't sound like a good thing to do in this situation. Basically, you will have to convince the tenant to pay you instead of the landlord, and then the tenant will have to deal with the landlord claiming that the tenant is doing something wrong and will be evicted unless he pays his rent. Not a good position for the tenant. Do you really want to squeeze an innocent tenant, and make them deal with your crazy irrational defendant/landlord like that?
If the defendant owns property that he rents out, then why not find out how he pays the mortgage and garnish the bank account that he uses to pay the mortgage (assuming the bank account is in his name). Why not put a lien on that property?